Re: About TIAs

Jan Panteltje <alien@comet.invalid> wrote:

 https://www.electronicdesign.com/technologies/analog/article/55250719/phlux-technology-tailoring-the-design-of-transimpedance-amplifiers-to-infrared-sensor-apps-part-2
 
I just drive the photo diode directly into the base of an NPN .....
 (ducks).
 

That’s basically a homebrew phototransistor, and may work great for
applications that don’t require high speed, low noise, or accurate
calibration. (There are lots of those.)

A slightly more advanced method is to replace the NPN with a cheap MMIC
amplifier. If you have at least a milliamp of photocurrent, that’ll get you
close to the shot noise, and it’ll be pretty fast unless the PD itself is
slow.

We sell fancier photoreceivers for much dimmer light, where it’s more
difficult to preserve both low noise and wide bandwidth.

Cheers

Phil Hobbs


--
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics